cat or no cat

[GWJCTD]

I was wondering if the cat is out is it better for towing?I already have the muffler delete (straight piped)?Is there any back pressure needed?

 

[RBell]

I can't say it was any better other than slightly lower EGT's. You'll know it when you hit a hill with a good load and that sucker starts barking at ya, MUCH louder IMO.

 

[GWJCTD]

It fell of before i could take it off! Fully sp! Dam loud!

 

[Turbo_Bob]

I was wondering if the cat is out is it better for towing?I already have the muffler delete (straight piped)?Is there any back pressure needed?

My truck was ordered from AZ, 03. 5 HO, and it had no CAT from the factory. I wish it did because my truck smells like a old dump truck compaired to the same models with a CAT. They really do work to clean up the smell. I removed the muffler and added the straight pipe from Geno's. Sounds like a 18 wheeler big-rig, I like that. There is zero backpressure with no CAT and muffler, plus the engine RPM's quicker. I did all this before I added the EGT so I dont know by how much lower the EGT's became doing this. The highest number I ever got was 1150 F pulling a 18' box trailer, 7,000 lbs up the very high and steep grades in CO, 11,000 feet at 55 MPH in 5th. EGT probe is 4" from the outlet of the head.

 

[george]

I believe cats were on the 12 valves then when the 24 valves came out there was no more cats until 2004. 5 when they appeared again

 

[RobertP]

i took mine off and will never look back. very happy with the lower egt's and added sound.

 

[JBROOKS]

"The best exhaust for a turbo charged engine is no exaust. " Kenne Bell. very good book he wrote a while back called BOOST. I always remembered that little quote.